Fixing deploy script + deleting script/README

scripts/deploy_text.sh

@@ -1,4 +1,8 @@
 #!/bin/bash
+#
+# This script generates the body text for deployment PRs in the Braze Docs repository.
+# 
+# Usage: ~/braze-docs/scripts/deploy_text.sh
 
 TEMP_FILE=$(mktemp)
 
@@ -20,5 +24,10 @@ echo "$COMMIT_LOGS" | while IFS=»¦« read -r title body; do
 done
 
 # Returns the results in reverse order and clean up files.
-tac "$TEMP_FILE"
+if command -v tac &> /dev/null
+then
+    tac "$TEMP_FILE" # 'tac' is used by default
+else
+    tail -r "$TEMP_FILE" # 'tail -r' is used if tac isn't available
+fi
 rm "$TEMP_FILE"

scripts/unused_link_cleaner.rb

@@ -1,3 +1,12 @@
+# This script deletes unused shortlinks from the bottom of a file, such as:
+#   [1]: {{site.baseurl}}/contributing/your_first_contribution/
+# 
+# Usage: ruby unused_link_cleaner.rb [option]
+#
+# Options:
+#   PATH/TO/FILE              Delete unused shortlinks in a single file.
+#   PATH/TO/DIRECTORY         Recursively delete unused shortlinks in a directory.
+
 require 'fileutils'
 require "readline"